Abrasive head



June 24, 1952 Filed July 21 1951 G. w. BRUNER 2,601,499

ABRASIVE HEAD 2 SHEETS-SHEET 1 uwnvroa /4 6 0x65 M4 BRl/NER.

June 24, 1952 w, BRUNER 2,601,499

ABRASIVE HEAD Filed July 21, 1951 2 SHEETS-SHEET 2 INVENTOR.

G'EOAGE n4 ZRl/IVEK.

Patented June 24, 1952 v UNITED STATES PATENT OFFICE ABRASIV E HEAD George W. Bruner, Indianapolis, Ind., assignor to Vonnegut Moulder Corporation, Indianapolis, Ind., a corporation Application July 21, 1951, Serial No. 237,905

Claims.

This invention relates to an abrasive head of that type which may be employed in grinding and smoothing or polishing products of metal, die castings and the like, as well as wood and other materials, particularly those having irregular surfaces, reference being had to Letters Patent to Plengemeier No. 2,125,460, granted August 2, 1938, and Letters Patent to Bradley No. 2,430,099, granted November 4,1947.

In heavy duty heads of this type much time is consumed on the job in resetting the exposed ends of the abrasive strips becoming worn down or destroyed. In treating metal products with the head the abrasive is so rapidly consumed as to require periodic resettings at short intervals in the course of the operations, wherein the abrasive strips are fed outwardly to present a newsurface.

Due to this condition, it is the purpose of this invention to simplify and facilitate the resetting operation so as to decrease the time and effort or strength required, and thereby improve the operator's efiiciency. For this purpose the head is so arranged that the abrasive winding drum may be quickly released for abrasive feeding and re-secured in its new position without releasing-the head from the spindle or loosening its locking nut.

Another feature of the invention resides in the structure for limiting the feeding of the abrasive to a predetermined extent. Once the head is set up each abrasive feeding operation permits only a limited predetermined maximum length of abrasive strip to be fed outwardly. By rcasonof such limitation, the operator need not consume time by determining the amount of abrasive he is feeding "out, but it will be automatically controlled which will result in a substantial saving in abrasive, as well as time and effort.

Still a further feature of the invention resides in the automatic feeding of abrasive from the head and a limit control therefor for limiting the amount of the abrasive fed from the head at each resetting. Heavy duty heads of this type require considerable force to rotate the winding drum to a new abrasive setting. By means of this invention, the winding drum is caused to rotate relative to the head through the combined action of inertia and centrifugal force. Thus, upon the adjusting collar being reset and rotative power applied to the head, the inertia of the drum will cause the head to rotate relative thereto; thereby effecting relative rotation therebetween in a direction to feed the abrasive strips outwardly to the new setting, the extent of such feeding being automatically limited to a predetermined amount of fresh abrasive.

A further feature of the invention resides in the provision of an annular series of indicia markings for indicating to the operator the total amount of abrasive fed from the head throughout a series of resetting operations so as to inform him of the amount of unused abrasive remaining in the head.

From the foregoing it will be observed that without disturbing the mounting of the head upon the spindle or the locking nut therefor, the adjusting collar may be reset to a predetermined position relative to the cap plate, to feed out a minimum amount of abrasive to as little as the pitch of one tooth, and a maximum amount limited to the slot or space in the winding drum between the projecting lugs thereon. Furthermore, this may be accomplished without the use of wrenches and the entire resetting job may be performed with a minimum of physical force whereby women operators may readily effect a resetting. In addition, the interlocking teeth provide a safety factor against accidental unloading or releasing of all the abrasive stored in the head at one time, since the relative rotation between the drum and the head is not dependent upon friction, as in the above patents, but the interlocking of the teeth. This safety factor is designed to inspire greater confidence in the operator when using the head.

The full nature of the invention will be understood from the accompanyingdrawings and the following description and claims:

Fig. l is an end view of the head.

Fig. 2 is a section taken on the line 2-2 of Fig. l with the abrasive adjusting collar released for a resetting operation, and a portion broken away.

Fig. 3 is the same as Fig. l with parts broken away.

Fig. 4 is a perspective view of the winding drum.

Fig. 5 is a perspective view of the abrasive adjusting collar. r f

Fig. 6 is a reduced illustration of the relation between the adjusting collar and winding drum, showing them in resetting position.

Fig. '7 is the same as Fig. 6 showing them in operating reset position.

In the drawings there is shown a driving spindle ID for mounting and driving the abrasive head, said head being secured on said spindle by a lock nut H. Said head includes a cylindrical hub l2 threaded at its outer end as indicated at l3. Secured to said hub there is an annular base plate I4 to which there is secured an annular series of brush holders l5, each holder being arranged at right angles to the plane of the base plate to slidably receive a brush head It carrying the brush bristles l1 extending radially outwardly from the head. Each of said brush holders is generally V-shaped in cross section with their free edges extending to interlock with and hold the brush heads in place, the upper ends of said holders being reduced at l8.

Surrounding said hub l2 there is an annular cap plate I9 mounted in corresponding spaced relation to the base plate I4, saidcap plate being provided with an annular series of apertures 23 for receiving and interlocking with the reduced ends [8 of the respective brush holders l5. Rotatably mounted about the drum l2 and between said plates there is an abrasive anchor and winding drum 2.] provided with an annular series of longitudinally slotted'bores 22in each of which there is provided-an abrasive anchor pin 23. The abrasive strips 24 are arrangedso that one strip extends between each pair of adjacent brushes lL-there being a plurality of said strips anchored to each .pin. For this purpose there is provided an abrasive loading in the formof a looped fabric 25 for mounting over the anchor pin, and having a pair of wings 26 between which ia plurality .of strips 24 is secured. Thus, as herein shown, there are eight anchor pins and thirty-two brushes, each loading including four abrasive strips.

Adjacent the outer endof the winding drum 2| there is provided and formed thereon a pair of angularly spaced abrasive limiting lugs 21 terminating in an end thrust bearing end 28 adjacent the end threads l3 on the hub l2, the space between said lugs providing a limit slot for the purpose hereafter described. The opposite end of the drum forms an end thrust bearing against a flanged portion of the hub 12. Operatively related with said drum there is provided an abrasive adjusting collar 29 on'the underside of which there is secured a gear ring 30 providing an annular series of teeth or serrations 3| adapted to mesh and interlock with a mating internal toothed ring 32 having teeth or serrations 33, secured to the capplate [9, The collar'29 is aper d to fi e he threa d e d o t eim I and is formed with a pair of opposed limiting ears 34 extending downwardly therefrom freely into the slot between the lugs 2] to bear against the 7 end surface of the drum 12] and provide an end thrust bearing support therefor. Said ears 34 are of less length than the slot between the lugs so that relative angular displacement between the drum 2| and the collar 29 will be permitted to a limited and predetermined degree.

The collar 29 is held in its reset position and tooth engagement with the cap plate by a releasable clamping knob 35 threaded upon the threads I3 of the hub l2. Said knob has its periphery knurled and is of suflicient diameter for convenient and forceful gripping to screw it into clamping engagement with said collar or back it oii to release said collar and disengage the teeth. The collar may then be reset for a predetermined abrasive feed out without disturbing the lock nut II.

In operation, the head may be loaded either when dismounted from the spindle or when mounted thereon. Thus, a new loading of the head may be effected without removing it from the spindle. This is accomplished by unscrewing and removing the knob 35 and collar 29 from the hub and then removing the cap plate I9. The winding drum will then be exposed for reception of the abrasive loadings without unloading or removing the lock nut H or the use of a wrench.

When it is merely desired to adjust the drum for a new ,feed out of. abrasive strips upon the ends thereof becoming worn -or damaged, it is only necessary to back off the clamping knob 35 sufficiently for axially displacing the collar 29 to disengage the teeth 3|, 33. The collar may then be reset and clamped by the clamping knob.

In this fashion a new setting is provided without efiort; without removing the head or the lock nut and without expending energy in actually rotating the winding drum to its new feed out position. The only accomplishment at this point is that the adjusting collar is reset to permit a predetermined and limited feed out of the abrasive.

Havi e n t u s t. p wer app ed t the head. Due to the inertia of the winding ,drum and the abrasive carried thereby resistin -.su c h rotative movement, relative rotation between the drum and the head will thereby be affected within the limitation permitted by the newly set spacing between the ears 34 and lugs 21, from their resetting position shown in 6 to their operating reset position shown in Big. u ve r t ti n and centriiusal e ee will feed the abrasive strips out to present fresh abrasive portions to a predetermined extent as thus determined. However, if it is desired-to feed the abrasive out to a lesser degree, the resetting position of the collar would be moved only the distance of one or more teeth so-as to reduce the maximum limit of spacingbetween the ears and lugs. The resettin operation havin bee ma e pri to a plyin power-a ter the p w s pp ied and the ab as ve autemat C y fed ou th op rati n o the head ma be continued. 7

By rovidin an ula di p acement indi ia 35 '2- on the cap p ate -9 semi-indies the o te peiphery o the adjusting cell r 1 mm w th-e fixed i-n ieia o said a;r. the eee ate ma readily observe the amount of abrasive which has been use an cor e o din l he amou or le t cf ab asiv strins s ll the: ead and usea-ble,

Summa i i s me bi theasivan a e 1 the above, it may be 1 1 53 hat when .16 hfl fl 15 l e o t espindle t ere is i,ll; lh of en he to Jessenmts reload. =0 i ed-eyt n abra e h save ac n eral e-am upt f time, Th amount 19 abras ve o be above-described, a factor that is very ta..- for economical and efiicient operation of the head. The operation =01 the abrasive teed -.out mechanism requires but little manual effort, making the readjustment of the abrasive not only more rapid, but also making it possible for'manipulation with slight physical eifort so that it is-convenient for womenpperators to readiust th a ras Furth r e; the p t ve abrasive look through interengagement of the teeth substantially minimizes the chances of accidental unloading .or releasing of allthe "abras- ,sive loaded in the head atone time, whether r ugh a essne s er eeke str neihin oekin up the hea 111 is t Qhly a eaiety teetor. but aisenspir s-exeaier the operator that the head will not explode when in use.

The invention claimed is:

1. In an abrasive head to be driven by a driving spindle including an annular series of radially-extending brushes between which abrasive strips are adapted to be extended, the combination therewith of a hub adapted to be secured on said spindle for rotation therewith, a hub plate extending radially from said hub and secured thereto, a cap plate surrounding said hub and spaced from said hub plate for mounting said brushes therebetween, an abrasive anchoring and winding drum rotatably mounted on said hub for anchoring and winding abrasive strips thereabout, said drum having a series of abrasive limiting lugs projecting from one end thereof through said cap plate, an abrasive adjusting collar rotatably mounted upon said hub having ears projecting inwardly between said lugs spaced from the adjacent ends thereof to permit of predetermined relative rotation between said collar and drum, an annular series of interlocking teeth carried by said collar and cap plate respectively for interlocking said collar and said plate in resetting position, and a clamping knob threaded on said hub for clamping said collar in interlocked relation with said cap plate.

2. In an abrasive head to be driven by a driving spindle including an annular series of radially extending brushes between which abrasive strips are'adapted to be extended, the combination therewith of a hub adapted to be secured on said spindle for rotation therewith and having a a radially-extending hub plate, a cap plate mounted on said hub spaced from said hub plate for mounting said brushes therebetween, an abrasive winding drum carried by said hub between said plates, said drum having spaced projections extending from the end thereof adjacent said cap plate, an abrasive adjusting collar rotatable upon said hub exteriorly of said cap plate having spaced projections extending inwardly for limited movement between said drum projections to permit rotation of said drum through a predetermined angular distance relative to said collar, interlocking projections carried by said collar and cap plate respectively for interlocking said collar and said plate in resetting position, and a clamping knob on said hub for clamping said collar in interlocked relation with said cap plate.

3. In an abrasive head to be driven by a driving spindle including an annular series of radially-extending brushes between which abrasive strips are adapted to be extended, the combination therewith of a hub adapted to be secured on said spindle for rotation therewith and having a radially-extending hub plate, a cap plate mounted on said hub in spaced relation to said hub plate between which said brushes are mounted, an abrasive winding drum rotatable on said hub between said plates, said drum having spaced projections extending from one end thereof adjacent said cap plate, an abrasive adjusting collar rotatable upon said hub having spaced projections extending inwardly for limited movement between said first-mentioned projections whereby said drum is permitted to rotate through a predetermined angular distance relative to said collar, an annular series of interlocking teeth carried by said collar and cap plate for interlocking said collar and said plate in resetting position, the pitch of said teeth being substantially less than the spacing between said projections, and a clamping knob on said hub for clamping said collar in interlocking relation with said cap plate.

4. In an abrasive head to be driven by a driving spindle, including an annular series of radially-extending brushes between which said abrasive strips are adapted to be extended, the combination therewith of a hub adapted to be secured on said spindle for rotation therewith having a radially-extending hub plate, a cap plate carried by said hub in spaced relation to said hub plate for mounting said brushes therebetween, an abrasive winding drum mounted on said hub between said plates for winding abrasive strips thereabout, said drum having an arcuate slot in the end thereof adjacent said capplate, an abrasive adjusting collar rotatably mounted on said hub exteriorly of said cap plate having a projection extending into the arcuate slot of said drum in predetermined spaced relation to the ends thereof to permit of a predetermined relative rotation between said collar and drum, interlocking elements carried by said collar and cap plate for angular adjustment therebetween to resetting position, and a clamping member engageable with said collar for looking it in. its reset position with relation to said cap plate while permitting limited predetermined relative rotation between said hub and plates in a direction to extend said abrasive strips within the limits of movement of said projection within said arcuate slot.

5. In an abrasive head to be driven by a driving spindle including an annular seriesof radially-extending brushes between which said abrasive strips are adapted to be extended, the combination therewith of a pair of spaced plates for mounting said brushes therebetween, means for securing said plates for rotation by said driving spindle, an abrasive winding drum surrounding said spindle and rotatably mounted between said plates, an abrasive adjusting collar surrounding said spindle exteriorly of one of said plates, interlocking projections on said drum and collar having a predetermined angular free play therebetween, interlocking elements between said collar and its adjacent plate, and a clamping member engageable with said collar for clamping it in interlocking engagement with said adjacent plate with said interlocking projections in predetermined spaced relation to permit limited relative rotation between said drum and plates in a direction to extend said abrasive strips from said head in accordance with the setting of said collar.

6. In an abrasive head to be driven by a driving spindle including an annular series of radiallyextending brushes between which said abrasive strips are adapted to be extended, the combination therewith of a pair of spaced plates for mounting said brushes therebetween, means for securing said plates for rotation by said driving spindle, an abrasive winding drum surrounding said spindle and rotatably mounted between said plates, an abrasive adjusting collar surrounding said spindle exteriorly of one of said plates, interlocking projections on said drum and collar having a predetermined angular free play therebetween, interlocking elements between said 001- lar and its adjacent plate, a clamping member engageable with said collar for clamping it in interlocking engagement with said adjacent plate with said interlocking projections in predetermined spaced relation to permit limited relative rotation between said drum and plates in a direction to extend said abrasive strips from said head in accordance with the setting of said collanandan annular series of indicia on said last-mentionedplate surrounding and adjacent .said collar forindicating the angular resetting thereof.

'7. An abrasive headadapted to be rotated at high speed including an abrasive winding drum rotatably mounted concentrically within said head, an abrasive adjusting collar mounted on and exteriorly of said head concentrically with said drum, said collar and drum beingprovided with interengagingprojections having free play therebetweento permit predetermined .angular displacement thereof,-an annular series of interlocking teeth on said head and collar respectively,-said collar being axially displaceable relative to said drum and head to effect disengagementof said teeth without disengaging said projections, and a clamping member movable on .said head into engagement with said collar for securing it in selected tooth engagement and releasing it frorntooth engagementfor resetting the relative angular positions of'said projections.

8. An abrasive head-adaptedto be rotated at high speed including -.an abrasive winding drum rotatably mounted concentrically within said head provided with aniarcuate slot at one end thereof, an abrasivemounting collar mounted exteriorlyof said head concentrically with said drum provided with a projection extending into said slot having free play therein to permit preinto engagement with said collar for securing it in selected tooth engagement and releasing it from tooth engagement for resetting the position of said projection in said slot.

9, An. abrasive head. adapted-to be rotated at 8 high speed including an abrasive winding drum rotatably mounted concentrically within .said head provided with anarcuate slot atone end thereof, an abrasive mounting collar mounted exteriorlyof said head concentrically with said drum provided with a projection; extending into said slot having free play therein to permit predetermined angular displacement .therebetween,

an annular series of interlocking teeth on said head and collar respectively, said collar vbeing axially displaceable relative to said drum and head toefiect disengagement of said teeth without removing said projectionifrom said slot, an annular series of indicia on .said head'adjacent and surrounding .said collar for indicating the extent of angular. displacementthereof throughout its several abrasive resettings, and a. clampingmember movable .on, saidhead into engagementwith said collar rforsecuring it .in selected tooth engagement and releasing .it ,from tooth engagement for resetting the position of said projection in said slot.

10. An abrasive head adapted toberotated at high speed, including anv abrasive winding drum rotatably mounted concentrically within said head, an abrasive adjusting collarmounted exteriorly of said head concentrically with said drum, saidcollar and drum being provided with interengaging projections having a free play therebetween, an annular series of interlocking teeth on-said headandcollar respectively, said collar-being axially .displaceable relative to said drum and head to effect disengagement of said teeth Without disengaging said projectionaand a clamping knob movable ,on said head into and outof engagement with said collar for securing it in selected teeth engagementwhen tightly engaged thereagainst and releasing it from teeth engagement when freed therefrom for permitting the resetting of the relativepositionsof said projections.

GEORGE W. BRUNER.

N 0 references cited. 

